Pump impeller



FIG. 1 is a top perspective view of a pump impeller showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a right side elevational view thereof. 

The ornamental design for a pump impeller, as shown. 